Water-tube boiler.



G. COOK.

WATER TUBE BOILER.

APPLICATION FILED FEB. 26. 1917.

1,290,096. 7 Patented Jan. 7,1919.

1 !SHEETS-SHEET l- I INVENTOR ATTORN EY G- COOK.

WATER TUBE BOILER.

APPLICATION mm FEB. 26. um.

Patented Jan. 7, 1919.

2 SHEETS-SHEET 2 INVENTOR 660076,

ATTORNEY ear WDTNESSES nib.

GEORGE COOK, 0 F BUFFALO, NEW YORK.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented Jan. 7, 1919.

Application filed February 26, 1917. Serial No. 150,992.

. is a specification.

This invention relates to water tube boilers, and is an improvement upon the invention covered by Letters Patent No. 1,008,526, granted to me November 14:, 1911.

An object of the present invention is to provide a construction in which the upper and lower portions of the boiler are in separate sections having annular chambers, and in which the lower section having a combustion chamber is of smaller cross section than the upper section, and to provide means whereby the water may be conducted from the annular chamber surrounding the combustion chamber into the annular chamber of the upper section. Another object of the invention is to improve the construction of the water tubes mounted above the combustion chamber and at the same time reduce the cost of constructing the same to a minimum, and to provide a construction which may be easily assembled and disassembled, and in which the maximum amount of radiating surface will be exposed to the heated products of combustion and hot gases, insuring that substantially all of the heated products of combustion and heated gases will touch some portion of the water tubes. I

In the accompanying drawings:

Figure 1 is a vertical sectional view through the boiler.

Fig. 2 is a cross sectional view on the line Fig. 3 is a cross sectional view on the line 33' of Fig. 1.

Figs. 4, 5 and 6 are similar cross sectional views, illustrating modified forms of water tubes.

Fig. 7 is a detail view of apart of Fig. 1 showing upon an enlarged scalethe manner of connecting the adjacent sections and the two part conduit together.

Fig. 8 is a detail sectional view,illustrating the means whereby the ends of the water tubes are connected to the inner cylindrical shell of the boiler.

In the embodiment of the invention here illustrated, there has been provided a base or ash-pit section 1. Mounted upon this section is a lower section comprising an inner cylindrical tubular shell 2, which is open at its ends and which constitutes the combustion chamber 3 of the boiler and a surrounding shell 4 spaced therefrom. The

lower edges of the shells are connected by means of a flange 5 while the upper edge of the outer shell is provided with an outwardly extending horizontal flange 6, and the upper edge of the inner shell 2 is provided with an outwardly extending horizontal flange 7 spaced above the flange 6 for a purpose which will be described more fully hereinafter. The space between the shells 2 and 4C constitutes an annular water chamber 8.

Mounted above the shells 2 and 4: is an 7 upper section which comprises an inner cylindrical shell 9 of a diameter greater than that of the shell 2 and a surrounding outer shell 10 spaced therefrom. The lower edges of the shells 9 and 10 are bent outwardly forming horizontal flanges 11 and 12, which are located in the same horizontal plane closing the space between the shells at the bottom, and located above the horizontal flange 6. Interposed between the flanges 11 and 12 and the flange 6 is a gasket 13, which is clamped between the flanges by means of suitable bolts 14 whereby a tight joint is insured. The outer edge 15 of the flange 7 is welded or attached in any suitable manner to the lower portions of the shell 9 immediately above the flange 11 thereof.

It will be seen that the interiors of the cylindrical shells 2 and 9 are in direct communication with each other, being mounted one above the other, and that the upper end of the shell 9 is closed by means of a hood or cap 16 Provided with a chimney 17 for the escape of the products of combustion. The outer shell 10 of the upper section projects some distance above the upper end of the inner shell, as will be seen by considering Fig. 1, and is likewise provided with a cap or hood 18 through which the pipe 17 projects. The space between the shells 9 and 10 constitutes an annularwater chamber 19, while the space between the caps 16 and 18 also provides a chamber 20, which is in open communication with the chamber 19. Outlet pipes 21 are provided through which hot water or steam, as the case may be, may be conducted through the system of radiators or the like. An inlet pipe 22 communicates with the lower end'of the annular chamber 8 whereby the cold water is admitted to the heater.

In order to provide means of communication between the lower chamber 8 and the upper chamber 19, which are separated by the flanges 6 and 11 and 12, there have been provided tubular conduits 23 which connect these annular chambers from a point below the separating flanges thereof to points above. Each of these tubular conduits comprises a lower elbow 24 which is threaded at one end through a suitable opening communicating with the lower chamber, as shown at 25, and is provided at its upper end with an annular flange 26 and an upper elbow 27 which is threaded at one end through an opening communicating with the upper annular chamber 19, as shown at 28, the opposite end of the elbow extending toward the lower elbow and provided with a flange 29. Interposed between the flanges 26 and 29 is a gasket 30, which is clamped between the flanges by means of bolts 31 extending through the flanges and gasket whereby the elbows are secured together, forming a water tight joint and a line of communication which is very cheap, easy to construct and easily assembled.

Mounted within the inner shell of the upper section of the boiler at each side thereof are sinuous water tubes 32 and 33. Each of these tubes comprises a series of parallel straight portions 34, the inner ends of which are connected together by the bends or portions 35, while the outer ends of the por-- tions 34 are connected together by the bends or portions 36. The portions 35 are arranged in the same straight line adjacent a diameter of the tube, while the portions 33 are arranged on a circular line concentric with the cylindrical shell 9 and spaced slightly apart therefrom. The ends of each sinuous tube are connected or communicate with short pipes 37 extending radially of the cylindrical shell 9. Each radially extending pipe communicates at one side 38 with the end of one of the shortest straight portions 34, while the inner end 39 thereof communicates with the next adjacent straight portion. The straight portions, it should be noticed, vary in length from the center toward each end whereby they are made to fit closely within the shell 9;

As clearly shown in Fig. 8 each pipe 37 has a nipple 40 extending through an opening 41 in the shell 9 and connected to the outer end of the pipe 37 by a threaded engagement, as shown at 42. The outer edge 43 of the nipple projects outside of the shell, is expanded, and bent against the walls thereof, whereby the water tubes are each securely fastened to the shell at two points only. In order to expand the outer edges of these nipples, removable plugs 44 have been provided in alinement therewith and located upon the outer shell 10-.

The adjacent straight portions of each of the sinuous water tubes are connected by braces 45, which securely hold them in alinement. As clearly shown in Fig. 2 at 46, the tubesof each pair are spaced apart, leaving a space through which tools and the like may be inserted for repairing.

As will be seen by considering Fig. 3, the lower water tubes are staggered with relation to the upper tubes, but are of the same construction. \Vhere a single pair of upper and single pair of lower tubes are used, the lower tubes will be located at right angles to the upper tubes whereby the products of combustion and heated gases must travel through a tortuous path coming in contact with a large area of the tubes whereby the, heating eflects are greatly increased. As clearly shown in Fig. 1, the tubes extend transversely of the shell and are arranged at a slight inclination in order to improve the circulation of water therethrough.

In Fig. 4, I have shown a modified form of construction which is especially adapt ed for use in connection with boilers of small cross section. In this construction a single sinuous tub is used in each plane. The boiler comprises the outer cylindrical shell 47 and the inner cylindrical shell 48 spaced from the outer shell and the sinuous water tube 49 which extends horizontally across the interior of the shell. This tub comprises a series of parallel straight portions 50 connected together at their ends by the bends or portions 51. The central straight portions are longer than the outer portions while the connecting portions 51 are arranged around a circle concentric with and slightly smaller than the circumference of the cylindricalshell 48. Suitable openings 52 are provided in the cylindrical shell at opposite ends of the tube 49. A short pipe 53 is attached at each end of the water tube, communicates at one side 54' with the shortest straight portion and at its inner end 55 with the next adjacent straight portion and is connected to the inner shell through an opening ,52, in the manner described above and illustrated in Fig. 8.

In Fig. 5, I have illustrated a modification for larger boilers, in which'thre separate water tubes are used in each plane and which extend across the space within the in ner shell. In the form here shown, the outer shell is indicated at 56 and the inner shell at 57. Sinuous tubes 58 are provided which are of the same construction and general outline as the tubes illustrated in Fig. 2. but which are spaced farther apart, provid ing a substantial space 59 between them. In th same plane with the tubes 58 and filling the space 59 is'a tube 60 comprising spaced apart parallel portions 61 extending at right angles to the straight portions of the sinuous tubes 58 and connected. at their opposite ends by curved common conduits 62 concentric with and spaced slightly inwardly of the shell 57 The common conduits are in turn connected to the inner shell 57 and communicate with the space between the shells by means of short radially extending pipes 63 fastened to the shell, as shown at 6d in a manner similar to that illustrated in Fig. 8.

In Fig. 6, there has been illustrated a further form for the larger types of boilers, in which the sinuous tubes are not used. In this construction there has been provided outer tubes 65 each comprising a plurality of spaced apart parallel portions 66 connected at their ends by common portions 67 curv ing around and adjacent the inner side of the inner shell and which in turn ar provided with radially extending pipes 68 fastened to the inner shell in the manner above described. Interposed between the tubes 65 is the tube 60 of a construction such as shown in Fig. 5, and which comprises the parallel portions 61*.

In operation, the water enters the lower annular chamber 8 from the inlet 22 and easily and quickly passes through the tubular conduits 23 to the upper annular chamber'19. The water then traverses the sinuous tubes and is further heated. The tubes are so arranged and so constructed that they present obstructions at all points across the shell, whereby a greater part of the heat comes in contact therewith at one time or another. The tubes in one plane are sta gered with relation to the tubes in another plane, whereby the heated products of combustion or heated gases must travel through a tortuous path in order to reach the chimney.

The sinuous tube herein illustrated is of such construction that it can be easily cleaned and easily mounted within the boiler. There are no sharp angles or corners in which dirt may accumulate and the construction is on which easily fits and is especially adapted for circular boilers, al though some aspects of the invention are applicable to boilers of other cross section.

Special emphasis is laid upon, the fact that the nd pipes 37 and the corresponding pipes illustrated in Figs. 4, 5 and 6 are an ranged radially with relation to the inner shell whereby they can be easily expanded and secured to the shell. This arrangement is especially advantageous for the reason that it has been hitherto very ditlicult to connect tubes of the construction herein shown and described to cylindrical boilers.

In the present invention, the-tubes are of such construction that more than three will be seldom necessary. The small number of tubes causes the water to pass through the same with more force than when the tubes ar more numerous, keeping the same clean and unclogged.

While I have shown and described one embodiment of my invention, and several modifications thereof, it is to be understood that I do not desire to be limited to the details of construction herein shown and described for obvious modifications will be apparent to anyone skilled in th art.

What is claimed is z 1. In a water tube boiler, a plurality of superimposed sections, each including inner and outer shells forming a water chamber therebetween, each upper section being of greater internal and external diameter than the next lower section, and each lower section having its outer shell of a diameter equal to that of the inner shell of the section directly above, means for joining the sections and closing the upper end of the lower water chamber and the lower end of the upper water chamber, communicating elbows arranged exteriorly of the boiler and independent of said joining means for connecting the sections together, water tubes arranged within an upper shell and communicating with its respective water chamher, and a fire box provided in a lower section.

2. In a water tube boiler, a plurality of superimposed sections, each including inner and outer shell forming'a water chamber therebetween, one of the sections being of greater internal and external diameters than the other section, communicating elbow opening into the water chambers of the sections and connecting the same together, water tubes arranged within one of the inner shells and opening into its respective water chamber, the outer shells having outwardly extendmg flanges at adjacent ends with means by which they are joined together, the inner shells also having outwardly extending flanges, the flange of the lower inner shell beingsecured to the upper inner shell above the junction of the flanges of the outer shells and closing the upper end of the lower water chamber, and the flange or the upper inner shell in connection with the joint between the outer shells closing the lower end of the upper water chamber.

3. The combination with spaced apart inner and outer cylindrical shells forming an annular chamber therebetween, of a water tube mounted within said inner shell and comprising substantially parallel straight portions which are shorter toward the ends of the tube and are connected together formmg a continuous sinuous tube which is arranged in a horizontal plane, and radially extending pipes arranged in the same plane with the straight portions of the tube and communicating with the two shortest straight portions at the ends of the tube and connecting the tube to the inner shell.

4. In a water tube boiler, a plurality of superimposed sections, each including inner and outer shells forming a water chamber.

therebetween, one of the sections being of greater internal and external diameters than the other section, communicating elbows opening into the water chambers for connecting the same together, water tubes arranged Within one of the inner shells and opening into the water chamber concentrically thereof, the inner shells being formed with outwardly extending horizontal flanges at adjacent ends thereof, whereby the water chambers are independent of each other, the outer shells at adjacent ends being formed with outturned horizontal flanges and adapted to be secured together, and a gasket between the flanges.

5. The combination with inner and outer shells forming a chamber therebetween, of a plurality of water tubes extending transversely in the same horizontal plane within the inner shell, each tube being of a size to occupy substantially one-half of the diameter of the inner shell and comprising substantially parallel straight portions connected together at their ends and provided with a single pair of nipples at its ends by which it is supported within the inner shell and through which it communicates with the chamber between the shells.

6. In a water heater, a lower section comprising spaced apart inner and outer shells forming a water chamber therebetween, an outwardly and horizontally extending flange at the upper edge of said outer shell, an upper section comprising an inner shell of a diameter greater than that of said first mentioned inner shell, and an outer shell of a diameter greater than that of said upper inner shell and surrounding the same to form a water chamber therebetween, said upper inner and outer, shells being provided with outwardly extending horizontal flanges above the said first mentioned flange, a gasket interposed between said flanges and clamped therebetween, and pipes forming means of communication between said lower and upper chambers.

7 In a water heater, a lower section comprising inner and outer shells spaced from each other forming therebetween an annular chamber, the upper edge of said outer shell being provided with a horizontally and outwardly extending flange, an upper section comprising inner and outer shells forming an annular chamber, the lower edges of said shells being provided with outwardly and horizontally extending flanges located above said first-mentioned flange, the diameter of said upper section being greater than that of said lower section, a gasket interposed between said flanges whereby a water tight joint is insured between the upper annular chamber and the lower annular chamber,

an elbow connected to and communicating with the upper end of said lower annular chamber, and a similar elbow connected to and communicating with the lower end of the upper annular chamber, the adjacent ends of said elbows being provided with flanges, a gasket interposed between said flanges, and bolts for clamping the flanges to the gaskets.

In testimony, that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

GEORGE COOK.

Witnesses JoHN H. SIGGERS, ANNIE MYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

